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Atari/Sega Master System
 
Here is the Atari/Sega Master System(aka Atari 2-button) interface schematic. It can be used for both Atari and Commodore style DB-9 single- and dual-button joysticks. The resistors are 1/8 watt, 10K ohm:

Atari/SMS Interface

If you do not have a dual-button stick, you may omit the connections to DB9-9.
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Last updated April 19, 1999. Comments welcomed.
This site and all information contained within is Copyright 1999 Earle F. Philhower, III. Iomega, Syquest, SparQ, Jaz, Zip, and other names are trademarks or property of their respective owners.